People in here don't have much knowledge of the animal kingdom. I chose the gorilla because you can stand very still and keep your head down, whatever you do, don't look it in the eye. Once it has finished its charge(a very scary moment) Do not run for fucksake. Chances are the gorilla will accept your submission and leave you alone.
Been watchin Congo?
For bears you should spread out your arms and yell as loud as you can at it. If that doesn't work, pray to whatever deity you may believe in